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Ribs and Sternum - Anatomy & Physiology (view source)
Revision as of 14:07, 4 August 2008
, 14:07, 4 August 2008no edit summary
**Expiratory muscles diminish the cavity and force air out
**Expiratory muscles diminish the cavity and force air out
*The most important thoracic muscle is the '''''Diaphragm''''', which separates the thoracic and abdominal cavities
*The most important thoracic muscle is the '''''Diaphragm''''', which separates the thoracic and abdominal cavities
[[Image: Cat diaphragm.jpg|thumb|right|150px|Cat diaphragm- Copyright Uwe Gille]]
*''Intercostal muscles''
**Dome-shaped, convex on its cranial surface
**Dome-shaped, convex on its cranial surface
**Central tendon forms the vertex
**Central tendon forms the vertex
***'''Caval foramen''' withing central tendon conveying [[Liver - Anatomy & Physiology#Vasculature|caudal vena cava]]
***'''Caval foramen''' withing central tendon conveying [[Liver - Anatomy & Physiology#Vasculature|caudal vena cava]]
**Innervated by the '''phrenic nerve''', which arises from the caudal cervical nerves (C5-C7)
**Innervated by the '''phrenic nerve''', which arises from the caudal cervical nerves (C5-C7)
**External fibers run caudoventrally and internal fibers run cranioventrally
**External fibers run caudoventrally and internal fibers run cranioventrally
**Each is confined to a single intercostal space
**Each is confined to a single intercostal space